Improvement in rotary pumps



UNITED STATES PATENT CEEICE.

GEO. w. HEALD AND L. D. slsco, OE BALDwiNsVILLE, NEW YORK.

IMPROVEMENT tN ROTARY PUMPS.`

Specilication forming part of Letters Patent No. 48,938, dated J ulyv 25.. 1865.

To all .whom may concern:

Be it vknown that we, GEORGE W. HEALD and L. 1181560, of Balrlwinsville, in the 'county of Onondaga and State of New York, have invented anew and useful improvement in Pumps; and We do hereby declare that ,the following is a full and exact description thereof', reference being had to the accompanying drawings, making part of this specitication.

Figure 1 is a plan of our improved pump',

the upper portion of the casing being removed for the purpose of showing the interior arrangement; Fig. 2, a vertical section inthe plane-of line :zn-. w, Fig. l; Fig. 3, a plan ofthe bottom of the piston' inverted or turned bot# tomupward.

Likletters of referenceindicate ,corresponding. parts in all the iigures.

Our'improved pump belongs to that class known as centrifugal pumps, the water be ing'drawn in and forced from the center to the periljihery and raised by centrifugal action.

Ass-represented in the drawings, A is the casing'or scroll, made in twoparts, which are secured together -by bolts a a; This casing does not dier essentially-from that ordinarily lused, except that we prefer to make the top and bottom plano instead of dishing or convex, as is usually the case.

The noveltyof our devlce consists, essentially, in the particular constructionl and ar-` rangement of the piston B. This is made a hollow shell inthe form of a wheel, having an outer rim, b, which fills the'vertical distance Awithin the casing'A, as shown. in Fyig. 2, and

having any desired number of arms, c' c,- which are inclosed or hollow, except at the ends, said arms' being curved backward opposite the inoportion of the casing A, and vthereby produc-` :ig undue frictionunderpressure; and, second, to retain the water that is thrown ont into the discharge-liassage g from returning-1': -back again toward the center.

It'will be seen. that `tliis eifect is accomplished, since the body of water thatenters the hollow arms of the,piston will be carried around `therein, escaping only through the outlets of the arms, and since the water thus thrown out into the discharge-passage will be -cut cil from return by the vertical rim 1 ),which revolves .rapidly and-fills the whole vertical y distax'ice-between the top 'and bottomot"r thecnse.

.VVenre aware that adevice' has been- .cnnA

ploycd in which the water is drawn into a hol.

low piston to prevent friction on the casing;

but in this case the ri'mb is not used to retainthe water in the discharge-passage of the scroll when once there. We are also 4aware'that sim.- ple arms or wings to the piston have been employed, having'projections at the periphery corresponding to a certain degree with the rim 11; bl' in this case the arms were not hollow, andtherefore the water was not inclosed 'in the piston, b ut came in contact with the outer casing atall points. Our invention con- .'sists in neither Of thesevdevices separately,

butin the combination of the essential features Ot' both, whereby a new and improved result is attained-viz., the receiving o f the water in a hollow piston to prevent undue friction on the casing, and the employment ofgan outer rim to the piston `to retain the water that` is thrown ont i'nto'the discharge-passage g.

What we claim-as our invention, and desire to lsecure by Letters Eatenaisrljhe construction ofthe piston B, vconsisting s of" the` rim b, and liollow arms c c, arranged and Aoperating substantially as and for the purpose herein set forth. f

L. D. SLSCO.

Witnesses DEWI'r'r C. GEEENEIELD, N. M.. WHITE. 

